US8449127B2 - Endoscope objective lens and endoscope using the same - Google Patents

Endoscope objective lens and endoscope using the same Download PDF

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US8449127B2
US8449127B2 US13/340,025 US201113340025A US8449127B2 US 8449127 B2 US8449127 B2 US 8449127B2 US 201113340025 A US201113340025 A US 201113340025A US 8449127 B2 US8449127 B2 US 8449127B2
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lens
endoscope objective
objective lens
endoscope
object side
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US20120154932A1 (en
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Yuko KATAHIRA
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Olympus Corp
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Olympus Medical Systems Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2423—Optical details of the distal end
    • G02B23/243—Objectives for endoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00096—Optical elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00186—Optical arrangements with imaging filters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00188—Optical arrangements with focusing or zooming features

Definitions

  • the present invention relates to an endoscope objective lens that has a simple configuration and is suitable for a compact, high-resolution image acquisition device usable in laser treatment and the like, and to an endoscope using the same.
  • a filter is disposed near the image plane, not at a position immediately behind the aperture stop where the angle of incidence on the filter is large.
  • a filter is disposed in immediate proximity to the image plane.
  • filters are disposed immediately in front of the aperture stop and between the aperture stop and a combined lens disposed therebehind.
  • Endoscope objective lenses achieve a wide angle of view by employing a retrofocus structure, in which a lens group having negative refractive power is disposed on the object side of the aperture stop, and a lens group having positive refractive power is disposed on the image side of the aperture stop.
  • a retrofocus structure in which a lens group having negative refractive power is disposed on the object side of the aperture stop, and a lens group having positive refractive power is disposed on the image side of the aperture stop.
  • this configuration is asymmetrical with respect to the aperture stop, correcting lateral chromatic aberration is especially difficult.
  • Objective lenses in which such lateral chromatic aberration is effectively corrected are known (for example, see Japanese Unexamined Patent Application, Publication No. 2007-249189).
  • a first aspect of the present invention is an endoscope objective lens comprising, in sequence from an object side, a front group, an aperture stop, and a back group, wherein the front group includes, in sequence from the object side, a negative first lens whose concave surface faces an image side and a positive second lens whose convex surface faces the object side and whose flat surface or concave surface is located on the image side, and a filter disposed between the first lens and second lens, and the back group includes, in sequence from the object side, a positive third lens whose convex surface faces the image side, and a combined lens formed of a plano-convex lens or a biconvex lens and a negative meniscus lens, and the endoscope objective lens satisfies the following Conditional Expression (1) and (2) n 3> ⁇ 3/12+5.5 (1) 2.0 >df/Ih> 1.5 (2) where n3 is the refractive index of the third lens, and ⁇ 3 is the Abbe number of the third lens, df is the sum of the thickness
  • a second aspect of the present invention is an endoscope including the above-described endoscope objective lenses.
  • FIG. 1 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to an embodiment of the present invention.
  • FIG. 2 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 1.
  • FIG. 3 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 2 .
  • FIG. 4 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 2.
  • FIG. 5 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 4 .
  • FIG. 6 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 3.
  • FIG. 7 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 6 .
  • FIG. 8 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 4.
  • FIG. 9 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 8 .
  • FIG. 10 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 5.
  • FIG. 11 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 10 .
  • FIG. 12 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 6.
  • FIG. 13 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 12 .
  • FIG. 14 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 7.
  • FIG. 15 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 14 .
  • FIG. 16 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 8.
  • FIG. 17 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 16 .
  • FIG. 18 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 9.
  • FIG. 19 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 18 .
  • FIG. 20 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 10.
  • FIG. 21 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 20 .
  • FIG. 22 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 11.
  • FIG. 23 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 22 .
  • FIG. 24 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 12.
  • FIG. 25 includes various kinds of aberration diagrams of the endoscope objective lens in FIG. 24 .
  • FIG. 26 is a lens cross-sectional diagram showing the configuration of an endoscope objective lens according to Example 13.
  • an endoscope objective lens 1 according to an embodiment of the present invention will be described below.
  • the endoscope objective lens 1 is formed of, in sequence from the object side, a front group FG, an aperture stop S, and a back group BG.
  • the front group FG includes, in sequence from the object side, a negative first lens L 1 whose concave surface faces the image side, a positive second lens L 2 whose convex surface faces the object side and whose flat surface is located on the image side, and a filter FL disposed between the first lens L 1 and the second lens L 2 .
  • Any filter such as a laser-light cut filter, a color-correcting filter, a transmission filter, an absorption filter, a reflection filter, or a polarizing filter, may be appropriately used as the filter FL.
  • Sapphire is preferably used as the glass material of the first lens L 1 .
  • sapphire is preferable for the first lens L 1 , which is externally exposed, because it is tolerant of high-temperature, high-pressure steam sterilization, called autoclave sterilization, and of chemicals used in chemical cleaning, which is usually performed in the use of endoscopes.
  • a glass material having high sterilization resistance and chemical resistance, such as zirconia, Yttria-stabilized zirconia, synthetic quartz, transparent YAG, or spinel, may be used instead of sapphire.
  • the back group BG includes, in sequence from the object side, a positive third lens L 3 whose convex surface faces the image side, and a combined lens E 45 formed of a plano-convex lens or a biconvex lens (in the example shown, a plano-convex lens) L 4 and a negative meniscus lens L 5 .
  • the back group BG satisfies the following Conditional Expression (1) n 3> ⁇ 3/12+5.5 (1) where n3 is the refractive index of the third lens L 3 , and ⁇ 3 is the Abbe number of the third lens L 3 .
  • Conditional Expression (1) defines the refractive index and Abbe number of the positive third lens in the back group.
  • the positive lens in the back group be composed of a material having a large Abbe number. By disposing the positive lens having small dispersion immediately behind the aperture stop, the lateral chromatic aberration can be effectively corrected. If Conditional Expression (1) is not satisfied, it is difficult to correct chromatic aberration in the entire system.
  • the endoscope objective lens 1 also satisfies the following Conditional Expressions (2) and (3) 2.0 >df/Ih> 1.5 (2)
  • df is the sum of the thicknesses of the optical element (the filter FL and the second lens L 2 ) and the inter-surface distance from the apex of the concave surface of the first lens L 1 to the aperture stop S
  • Ih is the maximum image height
  • f3 is the focal length of the third lens L 3
  • r3 is the image-plane-side radius of curvature of the third lens L 3 .
  • Conditional Expression (2) defines the proportion of the sum of the thickness of an optical element and the inter-surface distance from the apex of the concave surface of the first lens to the aperture stop to the maximum image height. If the lower limit of Conditional Expression (2), namely, 1.5, is not reached, it is difficult to ensure a sufficient space for disposing the filter or the like. If the upper limit 2.0 of Conditional Expression (2) is exceeded, although a space for disposing the filter or the like can be ensured, a need to increase the distance between the position behind the aperture stop and the image plane arises. As a result, the angle of incidence on the image plane increases, which may cause a shading phenomenon.
  • Conditional Expression (3) defines the proportion of the focal length of the positive third lens in the back group to the radius of curvature of the image-side surface.
  • the radius of curvature of the lens be larger than a certain value. Therefore, the focal length and the radius of curvature of the image-side surface of the third lens need to be balanced.
  • the thus-configured endoscope objective lens 1 can reduce the risk of damaging the filter FL during assembly by disposing the optical filter FL, which is a laser-light cut filter or the like, between the lenses L 1 and L 2 . Furthermore, by simultaneously satisfying Conditional Expressions (1) to (3), a compact configuration can be achieved while effectively correcting all optical aberrations, including lateral chromatic aberration, in a balanced manner. Therefore, the endoscope objective lens 1 can be suitably used in an endoscope having a compact, high-resolution image acquisition device usable in laser treatment and the like. Furthermore, by disposing the filter FL closer to the object side, the angle of incidence of light on the filter FL is reduced. Thus, color correction and blocking of light having wavelengths in the infrared region can be more effectively performed.
  • the optical filter FL which is a laser-light cut filter or the like
  • the back group BG may include a plurality of lenses having positive refractive power.
  • a sixth lens having a positive refractive index may be used as an optical component 3 .
  • This configuration is advantageous in correcting field curvature because the angle of incidence on the image plane can be corrected so as to be parallel to the optical axis by disposing a lens having positive refractive power near the image plane.
  • an optical-path changing device such as a prism or the like, may be disposed somewhere in the optical path.
  • a prism is disposed on the object side of the image acquisition device to change the optical path in a direction perpendicular to the optical axis.
  • an image acquisition surface of the image acquisition device can be disposed parallel to the optical axis, and the diameter of the tip of the endoscope can be reduced.
  • the direction in which the optical path is changed is not limited to a direction perpendicular to the optical axis.
  • the filter FL may be disposed behind the second lens L 2 in the front group FG. Also with this configuration, similarly to the above-described embodiment, damage to the filter FL can be prevented, and a reduction in size can be achieved while effectively correcting various aberrations.
  • r represents the radius of curvature
  • d represents the inter-surface distance
  • the number following r or d represents the surface number.
  • (a) represents spherical aberration
  • (b) represents astigmatism
  • (c) represents lateral chromatic aberration
  • (d) represents coma in the M direction
  • (e) represents coma in the S direction.
  • the aberration diagrams show aberrations for the d line (587.56 nm), serving as the reference wavelength, and aberrations for the C line (656.27 nm), the F line (486.13 nm), and the g line (435.83 nm) are also shown in the diagrams showing spherical aberration, lateral chromatic aberration, and coma. Furthermore, for coma, coma in a ray direction (M direction) and coma in a concentric circle direction (S direction) are shown.
  • the refractive indices listed in the lens data are the refractive indices for the d line. In the lens data shown in each example, r is radius of curvature, d is inter-surface distance, nd is refractive index, ⁇ is Abbe number, OBJ is object plane, IMG is image plane and S is stop.
  • FIG. 2 shows the configuration of an endoscope objective lens according to Example 1, and the lens data thereof are shown below.
  • FIG. 3 shows aberration diagrams of the objective lens according to this example.
  • the endoscope objective lens according to this example is formed of, in sequence from the object side, a front group, an aperture stop, and a back group.
  • the front group is formed of, in sequence from the object side, a negative first lens whose concave surface faces the image side, a filter, and a positive second lens whose convex surface faces the object side and whose flat surface is located on the image side.
  • the back group is formed of, in sequence from the object side, a positive third lens whose convex surface faces the image side, and a combined lens formed of a plano-convex lens and a negative meniscus lens.
  • FIG. 4 shows the configuration of an endoscope objective lens according to Example 2, and the lens data thereof are shown below.
  • FIG. 5 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 6 shows the configuration of an endoscope objective lens according to Example 3, and the lens data thereof are shown below.
  • FIG. 7 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 8 shows the configuration of an endoscope objective lens according to Example 4, and the lens data thereof are shown below.
  • FIG. 9 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 10 shows the configuration of an endoscope objective lens according to Example 5, and the lens data thereof are shown below.
  • FIG. 11 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 12 shows the configuration of an endoscope objective lens according to Example 6, and the lens data thereof are shown below. Furthermore, FIG. 13 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 14 shows the configuration of an endoscope objective lens according to Example 7, and the lens data thereof are shown below. Furthermore, FIG. 15 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1.
  • FIG. 16 shows the configuration of an endoscope objective lens according to Example 8, and the lens data thereof are shown below. Furthermore, FIG. 17 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has a configuration different from that according to Example 1 in that it has a positive plano-convex lens, which serves as a sixth lens and whose convex surface faces the object side, behind the combined lens in the back group.
  • FIG. 18 shows the configuration of an endoscope objective lens according to Example 9, and the lens data thereof are shown below. Furthermore, FIG. 19 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as Example 8.
  • FIG. 20 shows the configuration of an endoscope objective lens according to Example 10, and the lens data thereof are shown below. Furthermore, FIG. 21 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has the same configuration as Example 8.
  • FIG. 22 shows the configuration of an endoscope objective lens according to Example 11, and the lens data thereof are shown below. Furthermore, FIG. 23 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has a configuration different from that according to Example 1 in that a filter is disposed behind the second lens and in that a biconvex lens is used as the fourth lens.
  • FIG. 24 shows the configuration of an endoscope objective lens according to Example 12, and the lens data thereof are shown below. Furthermore, FIG. 25 shows aberration diagrams of the endoscope objective lens according to this example.
  • the endoscope objective lens according to this example has a configuration different from that according to Example 1 in that a positive meniscus lens is used as the third lens.
  • FIG. 26 shows the configuration of an endoscope objective lens according to Example 13, and the lens data thereof are shown below.
  • the endoscope objective lens according to this example has the same configuration as the endoscope objective lens according to Example 1 from the first lens to the combined lens, and an optical-path changing device P, which changes light in a perpendicular direction, is disposed on the object side of the image acquisition device.
  • Table 1 shows the respective parameters in Examples 1 to 13 and the values in Conditional Expression (1) to (3).
  • An endoscope objective lens comprising, in sequence from an object side:
  • the front group includes, in sequence from the object side, a negative first lens whose concave surface faces an image side and a positive second lens whose convex surface faces the object side and whose flat surface or concave surface is located on the image side, and a filter disposed between the first lens and the second lens, and
  • the back group includes, in sequence from the object side, a positive third lens whose convex surface faces the image side, and a combined lens formed of a plano-convex lens or a biconvex lens and a negative meniscus lens, and
  • the endoscope objective lens satisfies the following Conditional Expression (1) and (2) n 3> ⁇ 3/12+5.5 (1) 2.0 >df/Ih> 1.5 (2) where n3 is the refractive index of the third lens, and ⁇ 3 is the Abbe number of the third lens, df is the sum of the thickness of an optical element and the inter-surface distance from the apex of the concave surface of the first lens to the aperture stop, and Ih is the maximum image height. (Additional Item 2)
  • the endoscope objective lens according to any one of Additional Items 1 to 3, wherein the filter is an optical filter, which is not limited to an infrared-cut filter or a color-correcting filter.
  • the endoscope objective lens according to any one of Additional Items 1 to 4, wherein the first lens is made of a material having chemical resistance or sterilization resistance.
  • the endoscope objective lens according to any one of Additional Items 1 to 5, comprising an optical-path changing device, such as a prism or the like.
  • An endoscope comprising the endoscope objective lens according to any one of Additional Items 1 to 6.

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PCT/JP2010/072245 WO2011077972A1 (ja) 2009-12-24 2010-12-10 内視鏡用対物レンズ及びそれを用いた内視鏡

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US20140198398A1 (en) * 2011-06-23 2014-07-17 Olympus Medical Systems Corp. Endoscope Objective Optical System
US20180003944A1 (en) * 2015-09-07 2018-01-04 Hoya Corporation Endoscope magnification optical system and endoscope
US10670854B2 (en) * 2013-08-22 2020-06-02 Olympus Corporation Endoscope objective optical system

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JP5567224B2 (ja) * 2011-11-09 2014-08-06 富士フイルム株式会社 内視鏡用対物レンズおよび内視鏡
JP5450909B1 (ja) * 2012-05-17 2014-03-26 オリンパスメディカルシステムズ株式会社 内視鏡対物光学系
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WO2015131281A1 (en) 2014-03-04 2015-09-11 Novadaq Technologies Inc. Spatial and spectral filtering apertures and optical imaging systems including the same
EP3345024B1 (en) * 2015-08-31 2023-05-31 Stryker European Operations Limited Imaging system comprising a polarization filter and method of filtering polarized light in an imaging system
JP6542138B2 (ja) * 2016-02-08 2019-07-10 富士フイルム株式会社 内視鏡用対物レンズおよび内視鏡
WO2017145264A1 (ja) * 2016-02-23 2017-08-31 Hoya株式会社 内視鏡用変倍光学系及び内視鏡
EP3508900A4 (en) * 2016-09-01 2020-05-06 Olympus Corporation LENS OPTICAL SYSTEM FOR AN ENDOSCOPE
JP6404531B1 (ja) * 2016-12-21 2018-10-10 オリンパス株式会社 内視鏡用対物光学系
JP2018112677A (ja) * 2017-01-12 2018-07-19 ソニーセミコンダクタソリューションズ株式会社 撮像ユニットおよび電子機器
JP6553270B1 (ja) * 2018-08-14 2019-07-31 エーエーシー テクノロジーズ ピーティーイー リミテッド 撮像光学レンズ
CN109031606B (zh) * 2018-08-14 2020-11-17 瑞声光学解决方案私人有限公司 摄像光学镜头
CN109031599B (zh) * 2018-08-14 2020-10-23 瑞声光学解决方案私人有限公司 摄像光学镜头
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CN114839743B (zh) * 2022-04-19 2023-10-10 拾斛科技(南京)有限公司 内窥镜

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EP2498114A4 (en) 2012-11-07
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